125220505 has 4 divisors (see below), whose sum is σ = 150264612. Its totient is φ = 100176400.

The previous prime is 125220497. The next prime is 125220539. The reversal of 125220505 is 505022521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74183769 + 51036736 = 8613^2 + 7144^2 .

It is not a de Polignac number, because 125220505 - 2³ = 125220497 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12522046 + ... + 12522055.

It is an arithmetic number, because the mean of its divisors is an integer number (37566153).

Almost surely, 2^125220505 is an apocalyptic number.

It is an amenable number.

125220505 is a deficient number, since it is larger than the sum of its proper divisors (25044107).

125220505 is an equidigital number, since it uses as much as digits as its factorization.

125220505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25044106.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 125220505 is about 11190.1968257935. The cubic root of 125220505 is about 500.2938339561.

The spelling of 125220505 in words is "one hundred twenty-five million, two hundred twenty thousand, five hundred five".